by Tom Pelissero, USA TODAY Sports

by Tom Pelissero, USA TODAY Sports

Philadelphia Eagles tackle Lane Johnson has been suspended four games for violating the NFL's policy on performance-enhancing substances, the league announced Wednesday.

Johnson - the No. 4 overall pick in the 2013 draft who started all 16 games at right tackle as a rookie - said in a statement issued through the team that he "mistakenly and foolishly" took a prescription drug while training in April and failed to clear it with the Eagles' athletic trainers or check the banned substance list.

"I am extremely sorry for this mistake and I will learn from it and be smarter in the future," Johnson's statement said. "I would like to sincerely apologize to Mr. (Jeff) Lurie, (general manager) Howie Roseman, Coach (Chip) Kelly and his staff, my teammates and our amazing Philadelphia Eagles fans. This will be very hard on me to not be battling with my teammates for four games - but I will be ready and better than ever when I return."

The NFL does not announce what drug the player tested positive for.

The suspension will cost Johnson just $116,470 - 4/17ths of his $495,000 base salary in 2014. The four-year contract he signed last July included a $12,818,620 signing bonus.

Johnson will be eligible to participate in training camp and the preseason before beginning his suspension. He'll be eligible to return to the Eagles' roster Sept. 29, a day after the team's Week 4 game.

"We're very disappointed to learn of his suspension," the Eagles said in a statement. "We have spoken to Lane about the details of the suspension. He understood what he did wrong and took full responsibility. The key for him, however, is to learn from that mistake and move forward with his preparation for the 2014 season."